The Jargon File (version 4.4.7, 29 Dec 2003):

Chernobyl packet
 /cher?noh'b@l pak'@t/, n.

    A network packet that induces a broadcast storm and/or network meltdown
    , in memory of the April 1986 nuclear accident at Chernobyl in Ukraine.
    The typical scenario involves an IP Ethernet datagram that passes through a
    gateway with both source and destination Ether and IP address set as the
    respective broadcast addresses for the subnetworks being gated between.
    Compare Christmas tree packet.


The Free On-line Dictionary of Computing (30 December 2018):

Chernobyl packet

    /cher-noh'b*l pak'*t/ A network packet that
   induces a broadcast storm and/or network meltdown, named
   in memory of the April 1986 nuclear accident at Chernobyl in
   Ukraine.

   The typical scenario involves an IP Ethernet datagram
   that passes through a gateway with both source and
   destination Ethernet address and IP address set as the
   respective broadcast addresses for the subnetworks being gated
   between.

   Compare Christmas tree packet.

   [Jargon File]

   (2004-02-17)